Water Pump Impeller – Fits Honda 8–20 HP (Replaces 19210-ZW9-A31/19210-ZW9-A32)
Water Pump Impeller – Fits Honda 8–20 HP (Replaces 19210-ZW9-A31/19210-ZW9-A32) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller – Fits Honda 8–20 HP (Replaces 19210-ZW9-A31/19...
Water Pump Impeller – Fits Honda 8–20 HP (Replaces 19210-ZW9-A31/19210-ZW9-A32) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller – Fits Honda 8–20 HP is engineered for 4-stroke outboard engines from 2000 to 2013, including BF8, BF9.9, BF15, and BF20 models. It provides a reliable seal and efficient water circulation to prevent engine overheating. Please review the compatibility table for specific shaft length requirements, as fitment varies by model.
It serves as a direct replacement for Honda part numbers 19210-ZW9-A31 and 19210-ZW9-A32, along with Sierra 18-32455, GLM 91015, and CEF 500348.
- Installs with an internal drive key mount.
- Constructed from durable synthetic rubber for longevity.
- Engineered to meet OEM specifications for fit and performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Honda | 19210-ZW9-A31 |
| Honda | 19210-ZW9-A32 |
| Sierra | 18-32455 |
| GLM | 91015 |
| CEF | 500348 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Honda BF8 and BF9.9 models, this impeller is only compatible with extra-long shaft (25") configurations. For BF15 and BF20 models, it fits all shaft lengths.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Honda | BF8D | 8 | 4-Stroke | 2002–2013 | 19210-ZW9-A32 | Extra-long shaft (25") only |
| Honda | BFP8D | 8 | 4-Stroke | 2001–2007 | 19210-ZW9-A31 | Extra-long shaft (25") models |
| Honda | BF9.9D | 9.9 | 4-Stroke | 2002–2013 | 19210-ZW9-A32 | Extra-long shaft (25") only |
| Honda | BFP9.9D | 9.9 | 4-Stroke | 2001–2007 | 19210-ZW9-A31 | Extra-long shaft (25") models |
| Honda | BF15D | 15 | 4-Stroke | 2003–2006 | 19210-ZW9-A32 | All shaft lengths |
| Honda | BFP15D | 15 | 4-Stroke | 2003–2006 | 19210-ZW9-A32 | All shaft lengths |
| Honda | BF20D | 20 | 4-Stroke | 2003–2006 | 19210-ZW9-A32 | All shaft lengths |
| Honda | BFP20D | 20 | 4-Stroke | 2003–2006 | 19210-ZW9-A32 | All shaft lengths |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Connection
- Internal key mount
- Housing Material
- Synthetic rubber
- Housing Color
- Black
- Dimensions
- Width: 45.6 mm, Shaft: 16.2 mm, Thickness: 14.8 mm
- Fitting Type
- Internal drive key
- Other Technical Attributes
- Uses woodruff key for installation
What’s in the Box
- 1 x Impeller, Pump (UL) (Replaces 19210-ZW9-A32)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower unit gear oil.
- Remove the lower unit by unbolting it from the upper engine casing.
- Place the lower unit on a workbench and remove the water pump housing bolts.
- Slide the housing up to expose the old impeller. Note the rotational direction of the fins.
- Remove the old impeller, taking care not to lose the woodruff key from the driveshaft.
- Clean the housing and wear plate, inspecting for scoring or corrosion.
- Install the new woodruff key and slide the new impeller onto the shaft.
- Lubricate the inside of the housing and reinstall it, ensuring the impeller fins are oriented correctly.
- Torque the housing bolts to the manufacturer's specification.
- Reinstall the lower unit, refill the gear oil, and test the engine in the water.
Troubleshooting & FAQ
How do I know if this impeller fits my specific Honda model?
This impeller fits Honda BF8, BF9.9, BF15, and BF20 engines from specific year ranges. Crucially, for BF8 and BF9.9 models, it only fits extra-long shaft (25") versions. For BF15 and BF20 models, it fits all shaft lengths. Always check your engine model, year, and shaft length against the compatibility table.
What is the difference between 19210-ZW9-A31 and 19210-ZW9-A32?
Part number 19210-ZW9-A32 is the official supersession for 19210-ZW9-A31. This means it is the newer, recommended replacement part by the manufacturer. Both numbers refer to the same part in terms of fit and function for the applications listed.
What are the signs of a failing water pump impeller?
Common signs include a weak or intermittent water stream from the tell-tale port, frequent engine overheating alarms, and a dry, cracked, or brittle appearance of the old impeller upon inspection. It is a critical maintenance item that should be inspected regularly.
How often should I replace my outboard's impeller?
As a general rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you operate frequently in sandy, silty, or saltwater conditions.
Is the woodruff key included?
This package contains only the impeller. The woodruff key, gaskets, and housing plate should be purchased separately if needed or as part of a complete water pump repair kit.
Does this fit any other brands besides Honda?
No, this impeller is specifically designed and dimensioned for the Honda outboard models listed in the compatibility chart. Using it on other brands or models will likely result in poor performance or engine damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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